:root {
  color-scheme: dark;

  /* dark mode brand variables */
  --bg-primary: #040E14; /* Deep Space Black */
  --bg-secondary: #07151e;
  --bg-card: rgba(41, 98, 255, 0.03);
  --bg-glass: rgba(4, 14, 20, 0.85);
  --bg-header: rgba(4, 14, 20, 0.95);
  --bg-elevated: #0a1f2c;
  --bg-soft: rgba(41, 98, 255, 0.025);
  --page-glow-primary: rgba(41, 98, 255, 0.15);
  --page-glow-secondary: rgba(29, 233, 182, 0.08);

  --text-primary: #f5f7fb;
  --text-secondary: rgba(245, 247, 251, 0.84);
  --text-muted: rgba(245, 247, 251, 0.6);
  --text-inverse: #040E14;

  --border-primary: rgba(41, 98, 255, 0.15);
  --border-soft: rgba(41, 98, 255, 0.08);

  --accent-primary: #ffffff;
  --accent-secondary: #2972FF; /* Bright Sapphire Blue */
  --accent-gradient: linear-gradient(135deg, #2972FF 0%, #040E14 100%);
  --accent-soft: rgba(41, 98, 255, 0.08);
  --accent-ring: rgba(41, 98, 255, 0.16);
  --shadow-soft: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-card: 0 24px 54px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 30px 70px rgba(0, 0, 0, 0.38);
  --glow-primary: 0 0 0 1px rgba(41, 98, 255, 0.05), 0 0 34px rgba(41, 98, 255, 0.08);

  /* compatibility aliases */
  --color-ink: var(--text-primary);
  --color-muted: var(--text-muted);
  --color-soft: var(--bg-secondary);
  --color-paper: var(--bg-primary);
  --color-panel: var(--bg-secondary);
  --color-panel-raised: color-mix(in srgb, var(--bg-card) 80%, var(--bg-secondary));
  --color-line: var(--border-primary);
  --color-brand: var(--accent-primary);
  --color-brand-dark: var(--text-inverse);
  --color-accent: var(--accent-secondary);
  --color-success: #eef3ff;
  --color-error: #ffd6d6;

  --font-base: "Mona Sans", "Segoe UI";
  --font-display: "Mona Sans", "Segoe UI";
  --text-xs: 0.78rem;
  --text-sm: 0.86rem;
  --text-md: 1rem;
  --text-lg: 1.16rem;
  --text-xl: 1.18rem;
  --text-2xl: 1.45rem;
  --text-3xl: 4.85rem;
  --weight-regular: 400;
  --weight-medium: 600;
  --weight-bold: 700;
  --line-tight: 1.1;
  --line-normal: 1.65;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 5.5rem;
  --radius-sm: 0;
  --radius-md: 0;
  --container: 1350px;
  --header-height: 72px;
  --z-header: 20;
  --z-menu: 30;
  --transition: 180ms ease;
}

html[data-theme="light"] {
  color-scheme: light;

  --bg-primary: #f3f7fd;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-glass: rgba(255, 255, 255, 0.8);
  --bg-header: rgba(255, 255, 255, 0.78);
  --bg-elevated: rgba(255, 255, 255, 0.98);
  --bg-soft: rgba(235, 241, 250, 0.92);
  --page-glow-primary: rgba(37, 99, 235, 0.12);
  --page-glow-secondary: rgba(124, 58, 237, 0.08);

  --text-primary: #0f172a;
  --text-secondary: rgba(30, 41, 59, 0.84);
  --text-muted: rgba(71, 85, 105, 0.82);
  --text-inverse: #ffffff;

  --border-primary: rgba(148, 163, 184, 0.24);
  --border-soft: rgba(148, 163, 184, 0.16);

  --accent-primary: #2563eb;
  --accent-secondary: #7c3aed;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #4f46e5 48%, #7c3aed 100%);
  --accent-soft: rgba(37, 99, 235, 0.1);
  --accent-ring: rgba(79, 70, 229, 0.18);

  --shadow-soft: 0 18px 44px rgba(15, 23, 42, 0.08);
  --shadow-card: 0 18px 36px rgba(15, 23, 42, 0.12);
  --shadow-hover: 0 26px 56px rgba(37, 99, 235, 0.14);
  --glow-primary: 0 0 0 1px rgba(79, 70, 229, 0.05), 0 16px 42px rgba(37, 99, 235, 0.16);

  --color-success: #0f172a;
  --color-error: #7f1d1d;
}